What is the average speed at 20sec

is there anything else in the question like meters

If an object travels 50 meters in 10 seconds, it has an average speed of 50 meters/10 seconds, or 5 meters per second. If an object travels a distance of 100 kilometers in the course of an hour, it has an average speed of 100 kilometers per hour.

then 100 meters per 20 seconds is your answer